Hanging Glacier Prospect, Haines, Alaska, USAi

Regional Level Types
Hanging Glacier Prospect	Prospect
Haines	City Borough
Alaska	State
USA	Country

Location: This prospect occurs between an elevation of 5,100 and 5,700 feet above a small unnamed hanging glacier that is about 1/2 mile northwest of the Saksaia Glacier. The approximate center of the prospect is near the west-central edge of section 1, T. 29 S., R. 53 E. of the Copper River Meridian. It is shown in figure 7 of Still (1984 [OF 118-84]).
Geology: According to Still (1984 [OF 118-84]) and Still and others (1991), this prospect is an iron-stained zone of metasediments and hydrothermally altered metabasalt several hundred feet thick and about 2,000 feet long that strikes northeast and dips steeply north. The mineralization consists of barite lenses up to several feet thick and quartz-calcite ladder veins up to 0.5 feet thick. Both lenses and veins contain barite, pyrite, sphalerite, galena, and minor chalcopyrite. Samples from the lenses and veins contain up to 54% Ba, 14.1% zinc, 0.035% copper, 0.37% lead, 19.36 ppm silver, and 0.244 ppm gold. MacKevett and others (1974) note that the ladder veins occur within a 4- to 8-foot-thick altered dike that cuts the metavolcanic rocks. The ladder veins are as much as 6 inches thick and contain quartz, calcite, sphalerite, galena and minor chalcopyrite. They describe the barite lenses as a baritic footwall vein that contains fairly abundant galena and minor pyrite, sphalerite, and chalcopyrite. Sampling by Rubicon Minerals (1998) indicated values of up to 18.25% zinc, 0.11% copper, 0.05% lead, 0.49 ppm gold, and 36.2 ppm silver. Rubicon considers the Hanging Glacier prospect to be a volcanogenic massive-sulfide system that may be stratigraphically higher relative to the Cap (SK060) and Nunatak (SK058) prospects or, alternatively, a structural repetition of the Cap-Nunatak horizon (Rubicon Minerals, 1998). The Hanging Glacier prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OF 118-84]; Newberry and others, 1997).
Age: The Hanging Glacier prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OFR 118-84]; Newberry and others, 1997).

Commodities (Major) - Ag, Au, barite, Cu, Pb, Zn
Development Status: No
Deposit Model: Probably a volcanogenic massive-sulfide deposit with associated veining, some

Other Databases

Link to USGS - Alaska:	SK061

Other Regions, Features and Areas containing this locality

References